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I the case of simulation of a rectangular channel 6 m length and 2m in width, flow about 0.01 m3 / s. I took a boundary condition at the upstream (imposed flow) and downstream (height imposed) and solid wall without bond at the edges, the results I find the velocity fields exceeds the limit as shown in Figure. I did not understand the problem

Hello

We can not conclude that the velocity vector on the bord is going outside the domain, it could be a node which is very close to the boundary.
Try to zoom enough to see and verify that all the lateral nodes are set as solid nodes.
A final remark, I see that there is no inflow entering the domain, while you've said that you've prescribed it. To be verified.

With my best regards
Riadh